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FIZIKA A 8 (1999) 4 , 293-310
 
SLIDING SPIN-DENSITY WAVES: STUDIES OF CONDUCTION NOISE, MAGNETIC FIELD
DEPENDENCE AND HALL RESISTIVITY
M. BASLETIĆa, N. BIŠKUPb,c, B. KORIN-HAMZIĆb,
A. HAMZIĆa and S. TOMIĆb
aDepartment of Physics, Faculty of Science, Bijenička 32, HR-10000 Zagreb,
Croatia
bInstitute of Physics, Bijenička 32, HR-10000 Zagreb,
Croatia
cFlorida State University, Tallahassee, Florida, USA
Dedicated to Professor Boran Leontić on the occasion of his 70th
birthday
Received 22 November 1999; revised manuscript received 1 February 2000
Accepted 28 February 2000
We have studied the current-voltage characteristics of the (TMTSF)2PF6 in
the spin density state (SDW), and in zero and finite external magnetic field. For the
oscillating part of the nonlinear voltage response to the applied DC electric field, the
fundamental frequency distribution (as a function of this field) and a nonlinear relation
between the frequency and the SDW current reveal the growth of parallel conduction
channels characterized by lower velocities and larger cross-sections. The number of
fundamental frequencies, their amplitude and the level of low-frequency noise as well as
the depinning behaviour provide a consistent indication of the sample inhomogeneities and
associated local field variations, and might be well understood within the framework of
the phase slippage model. The increase of the threshold electric field with the applied
magnetic filed can be explained by the Bjeli-Maki theory, if the imperfect nesting is
taken into account. Finally, the electric-field dependence of the Hall resistivity is
consistent with the sliding mechanism of the SDW conduction.
PACS numbers: 74.70.Kn, 72.15.Nj, 75.30.Fv, 72.70.+m, 72.15.Gd
UDC 538.945
Keywords: organic superconductors, collective modes, one-dimensional conductors,
spin-density waves, noise processes, galvanomagnetic and other magnetotransport effects
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